Canon 100-400 Ghosting problems

[Steve Large]

I second the filter comment. With a particular filter (can't remember the name) results with my 100-400 were as you describe. Problem went away with removal of filter and almost went away with a quality filter such as Hoya. I'm with Alfred on this one- throw the filter away!

Hi Alfred and John,
I did some experientation in the back yard tonight with some common finches as my subjects without using the UV filter. There was a definite difference in quality over the results from the weekend. I will still leave my final decision for after I try some BIF shots to confirm. I can notice it much more easily with a bright sky background. Here is a post of one of the shots in the back yard from tonight.

Thanks,

Steve